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Finding the Fourth Proportional to 814.86, 1,222.29 and 631.80

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Solution

The fourth proportional to 814.86, 1,222.29 and 631.80 is: 947.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.86 : 1,222.29 = 631.80 : x
  2. Step 2: Convert to fraction form
    814.86/1,222.29 = 631.80/x
  3. Step 3: Cross multiply
    814.86x = 1,222.29 × 631.80
  4. Step 4: Simplify right side
    814.86x = 772,242.82
  5. Step 5: Solve for x
    x = 772,242.82/814.86
  6. Step 6: Final answer
    x = 947.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.